Comparative symbiotic performance of native rhizobia of the Flooding Pampa and strains currently used for inoculating Lotus tenuis in this region |
| |
Authors: | Analía Inés Sannazzaro Verónica Mariel Bergottini Rosalía Cristina Paz Luis Nazareno Castagno Ana Bernardina Menéndez Oscar Adolfo Ruiz Fernando Luis Pieckenstain and María Julia Estrella |
| |
Institution: | (1) Unidad de Biotecnolog?a 1, Instituto de Investigaciones Biotecnol?gicas- Instituto Tecnol?gico de Chascom?s (IIB-INTECH), UNSAM-CONICET, Camino de Circunvalaci?n Km 6, CC 164 (7130), Chascom?s, Argentina; |
| |
Abstract: | The Flooding Pampa (FP) is the most important area for cattle breeding in Argentina. In this region, persistence and yield
of typical forage legumes are strongly limited by soil salinity and alkalinity, which affect around 30% of the total area.
Instead, naturalized Lotus tenuis is the main forage legume in this region. Rhizobial strains currently used for inoculating L. tenuis in the FP are exotic or native from non-saline soils of this region, their taxonomic identity being unknown. Assuming that
rhizobia native from the most restrictive environments are well adapted to adverse conditions, the use of such isolates could
improve the productivity of L. tenuis in the FP. Hence, the goal of this study was to evaluate the symbiotic efficiency of selected L. tenuis rhizobia native from the FP, as compared with strains currently used for field inoculation of this legume. Under non-stressing
conditions, the symbiotic performance of native strains of FP exceeded those ones currently used for L. tenuis. Moreover, the symbiotic performance of the native strain ML103 was considerably high under salt stress, compared with strains
currently used as inoculants. Analysis of 16S rRNA gene sequencing revealed that unclassified rhizobia currently used for
field inoculation of L. tenuis and native strains grouped with the genus Mesorhizobium. As a whole, results obtained demonstrate that soils of the FP are a source of efficient and diverse rhizobia that could
be used as a sustainable agronomic tool to formulate inoculants that improve forage yield of L. tenuis in this region. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|